C.3) in all the trials carried out. The combination of high electrical conductivity and potassium silicate supplied gave good results. The possibility and benefits of applying Si amendments
in practice are examined. “
“Irrigation Selleckchem Ibrutinib water recycling is an increasingly important practice in agriculture in the context of diminishing water supply and the regulatory requirements in some parts of the world. This practice potentially accumulates and disseminates plant pathogens including Phytophthora species that pose a great threat to agriculture and forest ecosystems. Despite a high economic importance of Phytophthora species, the current understanding of their aquatic ecology is very limited. Therefore, a study was conducted to investigate the distribution and diversity of Phytophthora species in an irrigation reservoir of a commercial nursery in eastern Virginia over two consecutive winters. Multiple baits were deployed in surface water at a run-off entrance, 20, 40, 60 and 80 m from the entrance and near the pump inlet and at various depths at the 20-m station. Ten different Phytophthora species were detected in this study that included P. citrophthora, P. gonapodyides, P. hydropathica, P. inundata, P. irrigata, P. megasperma,
P. pini, P. polonica, P. syringae and P. tropicalis. Phytophthora recovery declined through the winters from November to March. It also declined with distance from the run-off entrance. These results suggest that water decontamination during winter irrigation events is required at this nursery and possibly in the nurseries Nintedanib (BIBF 1120) from the Alpelisib supplier southern part of the United States. The placement of the pump inlet away from run-off entrance may be a viable
strategy to reduce the crop health risk. “
“Nine isolates of Trichoderma were collected from Assiut Governorate, Egypt, as leaf surface and endophytic fungi associated with onion flora stalks. Four isolates were identified as Trichoderma harzianum, while five isolates were belonging to Trichoderma longibrachiatum. The antagonistic activity of these isolates against onion purple blotch pathogen Alternaria porri was studied in vitro using dual culture assay. All tested Trichoderma isolates showed mycoparasitic activity and competitive capability against the mycelial growth of A. porri. Mycoparastic activity of Trichoderma was manifested morphologically by the overgrowth upon the mycelial growth of the pathogen and microscopically by production of coiling hyphae around pathogen hyphae. Isolates of T. harzianum exhibited high ability to compete on potato dextrose agar (PDA) medium causing the maximum rate of pathogen inhibition (73.12%), while isolates of T. longibrachiatum showed inhibition rate equalling 70.3%. Chitinase activity of Trichoderma was assayed, and T.
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